Localization length in a random magnetic field

Details Localization length in a random magnetic field Localization length in a random magnetic field

1997-10-15

arxiv.org/abs/cond-mat/9710148v1

Phys. Rev. B 57, 870-878 (1998)

Physics

Condensed Matter

Disordered Systems and Neural Networks

12 two-column pages including 10 figures (epsfig), revtex, to appear in PRB

Scientific paper

10.1103/PhysRevB.57.870

Kubo formula is used to get the d.c conductance of a statistical ensemble of two dimensional clusters of the square lattice in the presence of random magnetic fluxes. Fluxes traversing lattice plaquettes are distributed uniformly between minus one half and plus one half of the flux quantum. The localization length is obtained from the exponential decay of the averaged conductance as a function of the cluster side. Standard results are recovered when this numerical approach is applied to Anderson model of diagonal disorder. The localization length of the complex non-diagonal model of disorder remains well below 10 000 (in units of the lattice constant) in the main part of the band in spite of its exponential increase near the band edges.

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